Method of making glass reflectors.



P. EMMENEGGER.

METHOD OF MAKING GLASS REFLECTORS.

APPLICATION FILED AUG-3|. 1915.

1 ,21 1 ,1%(), Patented Jan. 2, 1917.

,mzzzgzv Fl G. 2

FOG.3

WITNESSES INVENTOR WW 4 M vm FFTQ PETEREMMENEGGER, OF GUYAUX, PENNSYLVANIA.

METHOD OF MAKING GLASS REFLECTORS.

Specification of Letters Patent.

Patented Jan. 2, 1917.

Application filed August 31, 1916. Serial No. 117,869.

To all whom it may concern:

Be it known that I, PETER EMMENEGGER, a citizen of the United States, residing at Guyaux, in the county of Fayette and State of Pennsylvania, have invented a new and useful Improvement in the Methods of Making Glass Reflectors, of which the fol-- lowing is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification, in which,

Figure 1 is a sectional View through one form of mold, in which the first step of forming the reflectors is carried out. Fig. 2 is a similar view of the mold illustrating the second step of forming reflectors, and Fig. 3 is a sectional View through a completed reflector.

This invention relates to an improved method of forming glass reflectors having two concavo-convex walls adjacent to each other. I

The object of my invention is to provide an improved method whereby reflectors of this character can be made with the one heating of the glass. By the previous methods, a spherical bulb was blown which was then reheated and the end of the bulb was pressed back by means of a piece of wood during which time the operator drew the air from the bulb through the blow pipe to draw in the reflector surface.

In carrying out my invention, I use a semi-spherical mold such as shown in Fig. 1, having a body member 2 which is made of iron or any material which will act as a chill, and a bottom 3 which is formed of wood, paper, asbestos, or any other suitable composition, so that the glass will not be chilled when it comes in contact therewith.

The operator gathers the glass from which the blank is to be made on the end of a blow pipe 4, the glass being placed within the body of the mold 2 to which the bottom 3 is connected, and the blank is blown into approximately semi-spherical shape, as indicated in Fig. 1 of the drawings, so that the reflector is provided with a semi-- spherical wall 5 and a flat wall 6. As the semi-spherical wall 5 is in contact with the chilling surface of the mold portion 2 it will readily set, while the flat wall portion 6 which is in contact with. the non-chilling member 3 will remain plastic. The blank or partially blown reflector is then removed from the mold and held in position so as to permit the wall 6 to sag, as indicated at G in Fig. 2, or, if desired, the air may be withdrawn from the blown blank through the blow pipe t so as to cause the atmospheric pressure to press the wall 6 toward the wall After the blank has been chilled, it is cracked ofl from the blow pipe in the usual manner, annealed if desired, and then silvered.

The advantages of my invention result from the provision of a method whereby a glass reflector having two concavo-convex walls adjacent to each other may be blo n without reheating the partially formed blank. By the use of this method, considerable time and labor is saved in the manufacture of reflectors of this character, which will greatly reduce the cost of production.

I claim:

1. The method of formin glass reflectors, comprising the steps of siaping a blank into approximately semi-spherical form with a flat wall at one end thereof, and during the shaping chilling the semi-spherical wall and maintaining the flat wall in a plastic condi tion, and then causing the flat wall to approach the semi-spherical wall to form a second semi-spherical wall; substantially as described.

2. The method of forming glass reflectors, comprising the steps of shaping a blank into approxin'iately semi-spherical form with a flat wall at one end thereof, and during the shaping chilling the semi-spherical wall and maintaining the flat wall in a plastic condition, and then exhausting some of the air from the blank to cause the flat wall to approach the semi-spherical wall to form a second semi-spherical wall; substantially as described.

In testimony whereof, I have hereunto set my hand.

PETER EMMENEGGER.

Witnesses:

Jos. Boos, U. S. KING.

copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents,

' Waahington, ID. 0." e 

